Bumping gaia.json for 2 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/61e8a88f301a
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #16833 from zacc/bug_979320

Bug 979320 - Bolster wait in wait_for_cards_view to avoid edge gesture h...

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https://hg.mozilla.org/integration/gaia-central/rev/9c45470671cd
Author: Zac Campbell <zcampbell@mozilla.com>
Desc: Bug 979320 - Bolster wait in wait_for_cards_view to avoid edge gesture hit zones
Bumping manifests a=b2g-bump